docs: def _eval_dtype(cls, value):
          """Convert dtype into canonical form, check its applicability and return info.
          
          Parameters
          ----------
          value: np.dtype or something convertible to it.
  
          Returns
          -------
          value: np.dtype
          type_info: 
              Information about the dtype
          """
          value = np.dtype(value)
          if value.kind in "iu":
              type_info = np.iinfo(value)
          elif value.kind == "f":
              type_info = np.finfo(value)
          else:
              raise RuntimeError("Unsupported dtype. Only integer/floating-point types are supported.")
  
          return value, type_info